Time filter

Source Type

Bao G.,MOE Key Laboratory of Advanced Micro Structure Materials | Bao G.,Tongji University | Jiao H.,MOE Key Laboratory of Advanced Micro Structure Materials | Jiao H.,Tongji University | And 5 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2014

Short-wave pass filter is an important optical component in high power laser systems which has the repetitive structure of (0.5LH0.5L)N. But its optical property is significantly influenced by the half-wave hole due to layer inhomogeneity. Analysis by admittance theory shows the key reason for the presence of half-wave hole: the end point of the admittance locus of the periodic structure based on the quarter-wave stack doesn't return to the initial point again. The greater the deviation, the worse the half-wave hole. By inserting matching layers between high and low index materials, a new method is presented to eliminate half-wave hole. The new short-pass film is designed and successfully fabricated, which has a super wide and smooth region with low reflectance at around second harmonic.The experimental results consistent well with the theoretical performance.

Loading MOE Key Laboratory of Advanced Micro Structure Materials collaborators
Loading MOE Key Laboratory of Advanced Micro Structure Materials collaborators